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A method for separating lithium and magnesium and enriching lithium

An enrichment and lithium-magnesium technology, applied in chemical instruments and methods, lithium compounds, sustainable manufacturing/processing, etc., can solve the problems of low yield of lithium ions, achieve enrichment efficiency, high-efficiency enrichment and enrichment, and improve effect of rationality

Active Publication Date: 2020-01-10
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method reduces the magnesium-lithium ratio of salt lake brine to a certain extent and realizes the enrichment of lithium in brine, the lithium ion content in the finally obtained lithium-rich brine has not yet reached the lithium concentration required for the preparation of high-purity lithium salt. Continue the enrichment and concentration of lithium and the yield of lithium ions is low during the separation process

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  • A method for separating lithium and magnesium and enriching lithium
  • A method for separating lithium and magnesium and enriching lithium
  • A method for separating lithium and magnesium and enriching lithium

Examples

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Embodiment 1

[0032] This embodiment provides a method for separating and enriching lithium, combining figure 1 Shown is the flow process of this embodiment, the method of this embodiment includes the following steps:

[0033] Pre-treatment: The above-mentioned old brine from Yantian is diluted for the first time, and the old brine after the first dilution is sent to a multi-media filter to filter to remove some mechanical impurities such as sediment, and then sent to an organic ultrafiltration system to filter for complete removal. Miscellaneous, then carry out the second dilution, the dilution factor after twice dilution is 15 times, obtains the brine after the pretreatment.

[0034] Separation: The pretreated brine is separated through a nanofiltration separation system to obtain nanofiltration fresh water and nanofiltration concentrated water. The concentration of lithium ions in the nanofiltration fresh water is 1.2g / L, and the concentration of magnesium ions is reduced to 0.12g / L , t...

Embodiment 2

[0044] The present embodiment provides a method for separating and enriching lithium, comprising the following steps:

[0045] Pre-treatment: The above-mentioned old brine from Yantian is diluted for the first time, and the old brine after the first dilution is sent to a multi-media filter to filter to remove some mechanical impurities such as sediment, and then sent to an organic ultrafiltration system to filter for complete removal. Miscellaneous, then carry out the second dilution, the dilution factor after twice dilution is 15 times, obtains the brine after the pretreatment.

[0046] Separation: The pretreated brine is separated through a nanofiltration separation system to obtain nanofiltration fresh water and nanofiltration concentrated water. The concentration of lithium ions in the nanofiltration fresh water is 0.27g / L, and the concentration of magnesium ions is reduced to 0.10g / L , the mass ratio of magnesium ions to lithium ions is 0.38:1. specifically is:

[0047]...

Embodiment 3

[0056] The present embodiment provides a method for separating and enriching lithium, comprising the following steps:

[0057] Pre-treatment: The above-mentioned old brine from Yantian is diluted for the first time, and the old brine after the first dilution is sent to a multi-media filter to filter to remove some mechanical impurities such as sediment, and then sent to an organic ultrafiltration system to filter for complete removal. Miscellaneous, then carry out the second dilution, the dilution factor after twice dilution is 15 times, obtains the brine after the pretreatment.

[0058] Separation: The pretreated brine is separated by a nanofiltration separation system to obtain nanofiltration fresh water and nanofiltration concentrated water. The concentration of lithium ions in the nanofiltration fresh water is 0.81g / L, and the concentration of magnesium ions is reduced to 0.29g / L , the mass ratio of magnesium ions to lithium ions is 0.36:1. specifically is:

[0059] The ...

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Abstract

The invention relates to the technical field of solution separation and purification, and particularly relates to a method for separating lithium and magnesium and enriching lithium. The method comprises the following steps: diluting and filtering saltern old brine to obtain pre-treated brine; separating the pre-treated brine through a nano-filtration separation system to obtain nano-filtrated fresh water and nano-filtrated concentrated water; performing primary concentration on the nano-filtrated fresh water through a reverse osmosis system to obtain reverse-osmosis concentrate and reverse-osmosis fresh water; and performing secondary concentration on the reverse-osmosis concentrate through an electrodialysis system to obtain electrodialyzed concentrated water, which is a lithium ion-enriched solution, and electrodialyzed fresh water. In the separation step, the nano-filtration separation system comprises at least two stages of nano-filtration separation devices, and each stage nano-filtration separation device consists of multiple sections of nano-filtration separation units which are connected in series; and the pre-treated brine is subjected to magnesium lithium separation through multiple sections of nano-filtration separation units of the nano-filtration separation device and multiple sections of nano-filtration separation units of the next stage nano-filtration separation device. The method can be used for improving the magnesium lithium separation efficiency and the lithium enriching efficiency.

Description

technical field [0001] The invention belongs to the technical field of solution separation and purification, in particular to a method for separating lithium and magnesium and enriching lithium. Background technique [0002] Lithium is a very important strategic resource. As the lightest metal element, lithium exists in two forms: solid ore and liquid ore in nature. my country is rich in lithium resource reserves, and the proven industrial reserves of lithium resources rank second in the world, of which lithium brine accounts for 79%. The prospective reserves of lithium brine in salt lakes in the Qinghai-Tibet Plateau alone are equivalent to the total proven reserves of other countries in the world. . It is estimated that Qinghai Salt Lake lithium reserves (calculated as lithium) are 1.5 million tons, ranking first in the country. Therefore, the technology of extracting lithium from salt lake brine has become the top priority of my country's competition for energy strategic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/00
CPCC01D15/00Y02P20/10
Inventor 王敏赵有璟张大义李燕罗智波王怀有杨春节昝超唐发满
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI